Our rear bumper is open like that, and I wanted the welder at Machinists, Inc (where the frame was repaired and painted) to seal it up, but he said it would be far better left open so it could dry out completely between getting wet, rather than potentially trap moisture.
Seemed to me if he were a great welder, he could prevent it from having any gaps at all, but he said to just leave it. So we left it.
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